fixture.ts

1import { mkdir, mkdtemp, writeFile } from "node:fs/promises";2import { tmpdir } from "node:os";3import { join } from "node:path";4import { blake3 } from "@noble/hashes/blake3.js";5import { bytesToHex } from "@noble/hashes/utils.js";6import type { ReleaseFile } from "../src/bucket/repo.ts";78export type Fixture = {9	bucketDir: string;10	repo: string;11	repoDir: string;12	/** Every save, newest first, checkpoint included. */13	saveIds: string[];14	/** Strips a path from every save with koh3, so tests can sync before and after. */15	strip(path: string): Promise<void>;16};1718// The smallest valid PNG (1×1), so the fixture has a real binary file.19const PNG = Uint8Array.from(20	atob(21		"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==",22	),23	(c) => c.charCodeAt(0),24);2526const README = `<!-- a leading comment and a centred title are not the intro -->2728<p align="center">DEMO</p>2930# Demo3132A small repo for **Kepr's** tests.3334See [the guide](docs/guide.md), [the site](https://example.com) and [a trap](javascript:alert(1)).3536![logo](docs/logo.png)3738<script>alert("raw html")</script>39`;4041/**42 * Builds a genuine Koh 3 folder remote with koh3 itself, under a throwaway HOME. The line is:43 * "add docs, a secret and a deep helper" (flagged) → a second later "add readme and entry point"44 * (agent and session) → a checkpoint holding an edit to the guide → "say hello" (head).45 */46export async function makeKohBucket(repo = "demo"): Promise<Fixture> {47	const root = await mkdtemp(join(tmpdir(), "kepr-fixture-"));48	const home = join(root, "home");49	const bucketDir = join(root, "bucket");50	const repoDir = join(root, "work", repo);51	await mkdir(home);52	await mkdir(join(repoDir, "src/lib/deep"), { recursive: true });53	await mkdir(join(repoDir, "docs"));54	await mkdir(join(repoDir, "vendor"));55	const koh = (...args: string[]) => run(repoDir, home, args);5657	koh("init");58	koh("remote", "folder", bucketDir);59	await writeFile(join(repoDir, "docs/guide.md"), "# Guide\n\nRead me.\n");60	await writeFile(join(repoDir, "docs/logo.png"), PNG);61	await writeFile(join(repoDir, "secret.txt"), "hunter2\n");62	await writeFile(63		join(repoDir, "src/lib/deep/util.ts"),64		"// The *one* helper. Deep down.\nexport const one = 1;\n",65	);66	await writeFile(join(repoDir, "vendor/big.c"), "int x;\n".repeat(100));67	koh("save", "add docs, a secret and a deep helper");68	const first = JSON.parse(koh("log", "--json")).head_id as string;69	koh("flag", first, "--reason", "holds a secret");70	// Saves a second apart, so the timeline has time to spread over.71	Bun.sleepSync(1100);72	await writeFile(join(repoDir, "README.md"), README);73	await writeFile(join(repoDir, "src/main.ts"), "// Entry point.\nconsole.log('hi');\n");74	koh("save", "add readme and entry point", "--agent", "test-agent", "--session", "fixture");75	// The guide's edit is first recorded by the checkpoint; the Atlas must credit it to "say hello".76	await writeFile(join(repoDir, "docs/guide.md"), "# Guide\n\nRead me. It is short.\n");77	koh("checkpoint", "before the second change");78	await writeFile(join(repoDir, "src/main.ts"), "// Entry point.\nconsole.log('hello');\n");79	koh("save", "say hello");80	koh("offer");8182	const log = JSON.parse(koh("log", "--json")) as { saves: { id: string }[] };83	return {84		bucketDir,85		repo,86		repoDir,87		saveIds: log.saves.map((save) => save.id),88		strip: (path) => strip(repoDir, home, path),89	};90}9192function run(cwd: string, home: string, args: string[]): string {93	const result = Bun.spawnSync(["koh3", ...args], { cwd, env: env(home) });94	if (result.exitCode !== 0) {95		throw new Error(96			`koh3 ${args.join(" ")} failed: ${result.stderr.toString()}${result.stdout.toString()}`,97		);98	}99	return result.stdout.toString();100}101102function env(home: string) {103	return { PATH: process.env.PATH, HOME: home, NO_COLOR: "1" };104}105106// `koh strip` insists on a terminal and a typed confirmation, so it runs under a Bun PTY.107async function strip(cwd: string, home: string, path: string): Promise<void> {108	let output = "";109	const proc = Bun.spawn(["koh3", "strip", path], {110		cwd,111		env: env(home),112		terminal: { cols: 120, rows: 24, data: (_term, data) => (output += data.toString()) },113	});114	proc.terminal?.write(`y\n${path}\n`);115	const code = await proc.exited;116	proc.terminal?.close();117	if (code !== 0) throw new Error(`koh3 strip ${path} failed: ${output}`);118}119120/** Repos with one koh3 save each, all offered to one folder remote: enough history for releases. */121export async function makeRepos(122	names: string[],123): Promise<{ bucketDir: string; saves: Record<string, string> }> {124	const root = await mkdtemp(join(tmpdir(), "kepr-repos-"));125	const home = join(root, "home");126	const bucketDir = join(root, "bucket");127	await mkdir(home);128	const saves: Record<string, string> = {};129	for (const [i, name] of names.entries()) {130		const repoDir = join(root, "work", name);131		await mkdir(repoDir, { recursive: true });132		run(repoDir, home, ["init"]);133		if (i === 0) run(repoDir, home, ["remote", "folder", bucketDir]);134		await writeFile(join(repoDir, "README.md"), `# ${name}\n\nThe ${name} project.\n`);135		run(repoDir, home, ["save", `release ${name}`]);136		saves[name] = JSON.parse(run(repoDir, home, ["log", "--json"])).head_id;137	}138	return { bucketDir, saves };139}140141/** A release file with its bytes, or only as a record declares it (the bytes are then a stand-in). */142export type FixtureFile = { platform: string; name: string; bytes: Uint8Array } | ReleaseFile;143144export type FixtureRelease = {145	version: string;146	save: string;147	notes?: string;148	publishedAt?: number;149	files: FixtureFile[];150};151152/**153 * Publishes a release into a folder remote as `koh offer --builds` does (§11.2): the files, then154 * release.json, then `releases/latest`. koh3 3.0.72 has no `--builds`, so this writes them itself.155 */156export async function writeRelease(157	bucketDir: string,158	repo: string,159	release: FixtureRelease,160	latest = true,161): Promise<void> {162	const dir = join(bucketDir, repo, "releases", release.version);163	const files: ReleaseFile[] = [];164	for (const file of release.files) {165		const bytes = "bytes" in file ? file.bytes : new TextEncoder().encode(`stand-in ${file.name}`);166		await mkdir(join(dir, file.platform), { recursive: true });167		await writeFile(join(dir, file.platform, file.name), bytes);168		files.push(169			"bytes" in file170				? {171						platform: file.platform,172						name: file.name,173						size: bytes.length,174						blake3: bytesToHex(blake3(bytes)),175						sha256: new Bun.CryptoHasher("sha256").update(bytes).digest("hex"),176					}177				: file,178		);179	}180	const record = {181		format: 1,182		repo,183		version: release.version,184		save: release.save,185		published_at: release.publishedAt ?? 1790000000,186		machine: "fixture",187		notes: release.notes ?? "",188		files,189	};190	await writeFile(join(dir, "release.json"), JSON.stringify(record, null, 2));191	if (latest) await writeFile(join(bucketDir, repo, "releases", "latest"), release.version);192}